Solar vessel



FIG. 1 is a perspective view of a solar vessel showing my new design;

FIG. 2 is a front elevation view thereof, the rear elevation view being a minor image thereof;

FIG. 3 is a right side elevation view thereof, the left side elevation view being a mirror image thereof;

FIG. 4 is a top plan view thereof; and,

FIG. 5 is a bottom plan view thereof. 

The ornamental design for a solar vessel, as shown and described. 